Introduction Of China Nut Tightening

  •  When you tighten the China Nut, you will use three and a half turns, which is generally recognized by everyone, but have you thought about why this is the case? Why not just twist it two and a half turns? The following editor will tell you about it.

     In most German high-end machinery and equipment factories, when assembling special parts, tightening screws is guided by strict operation manuals, and there are clear regulations on how much torque is applied. In fact, after the screw is tightened, in order to prevent loosening, an additional pre-tightening force should be applied. Therefore, the pre-tightening force will be eliminated after a half-turn is loosened. The screw is in elastic deformation after tightening, especially under high temperature and vibration load. Long-term such continuous pressure will cause creep, and after the screw becomes plastically deformed, its strength will drop significantly or even fail. The return half-turn is to restore the elastic deformation and eliminate the pre-tightening stress. In the future, the screw will be deformed under continuous pressure or in the elastic deformation. The probability of plastic strain and failure of Bolt Factory is greatly reduced, so that the screw can maintain continuous high strength It is impossible to achieve such an effect by directly twisting two and a half turns.